Step 1Heat the oil in a large skillet over medium-high heat. Add the onions and cook, stirring just until they start to soften, about 2 minutes. Add the garlic, ginger, cumin, coriander, cardamom, salt and cayenne. Cook, stirring, until the garlic, ginger and spices are very fragrant, about 2 minutes.
Step 2Add the chard, potatoes and vegetable broth and bring to a boil. Reduce the heat to low, cover and cook until the potatoes are tender, about 15 minutes.
Step 3Stir in the lime juice and cilantro, then serve.